"This mission is a demonstration of USA resolve and a clear message that the president has many military options to defeat any threat", it said in a statement. China time with a magnitude of 3.4 and a depth of zero kilometers, the China Earthquake Networks Center said in a statement.
South Korea said no specific sound waves generated by artificial earthquakes were detected. "We can not conclusively confirm at this time the nature of the event".
Ri Yong-ho's comments to the General Assembly mimicked Mr Trump's remarks at the United Nations on Tuesday, when he called North Korean leader Kim Jong-un a "rocket man on a suicide mission".
The North carried out its sixth and most powerful nuclear test in September.
U.S. aircraft, shown here conducting a mission over the Korean Peninsula, flew off the east coast of North Korea on September 23, 2017.
The patrols came after experts said a small natural disaster near North Korea's nuclear test site last night was probably not man-made, easing fears the North had exploded another nuclear bomb, just weeks after its last one.
Pyongyang conducted its sixth and largest nuclear test on September 3 and has launched dozens of missiles this year as it accelerates a program aimed at enabling it to target the USA with a nuclear-tipped missile.
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The bomber flight and quake came at the end of a week that saw a blistering war of words between Kim and Trump, with the U.S. leader using his maiden speech at the United Nations General Assembly to warn that Washington would "totally destroy" the North if America or its allies were threatened.
Yong Ho, during a visit to NY for the United Nations General Assembly (UNGA), asserted that the recent economic sanctioned imposed by the UN and the United States, will not prevent his country from developing a nuclear force that is capable of hitting the U.S. mainland. He said in remarks broadcast on South Korean TV that the countermeasures flagged by Kim might refer to a "strongest-ever" ground-level test of a hydrogen bomb in the Pacific.
Trump and Kim have been trading insults and threats. over Pyongyang's nuclear ambitions and each have threatened military action.
Trump continued the heated exchange with the North Koreans Saturday night.
As with much that has transpired lately in the U.S. Since Kim came to power after the death of his father Kim Jong Il in 2011, he has ramped up nuclear and missile weapon tests.
Earlier this month, North Korea conducted its most powerful nuclear test to date, drawing stiffer United Nations sanctions. It also has a vast array of conventional artillery aimed at Seoul.